PHP mysqli_stmt_prepare()用法及代碼示例

定義和用法

這個mysqli_stmt_prepare()函數準備執行的 SQL 語句，您可以在此查詢中使用參數標記 ("?")，為其指定值，並稍後執行。

用法

mysqli_stmt_prepare($stmt, $str);

參數

Sr.No	參數及說明
1	stmt(Mandatory) 這是一個表示語句的對象(由 mysqli_stmt_init() 函數返回)。
2	str(Mandatory) 這是指定所需查詢的字符串值。

返回值

此函數返回一個布爾值，它在成功時為真，在失敗時為假。

PHP版本

這個函數最初是在 PHP 版本 5 中引入的，適用於所有後續版本。

示例

以下示例演示了 mysqli_stmt_prepare() 函數的用法(程序風格) -

<?php
   $con = mysqli_connect("localhost", "root", "password", "mydb");

   $query = "CREATE TABLE Test(Name VARCHAR(255), AGE INT)"; 
   mysqli_query($con, $query);
   print("Table Created.....\n");

   //Initializing the statement
   $stmt = mysqli_stmt_init($con);

   mysqli_stmt_prepare($stmt, "INSERT INTO Test values(?, ?)");
   mysqli_stmt_bind_param($stmt, "si", $Name, $Age);
   $Name = 'Raju';
   $Age = 25;
   print("Record Inserted.....");

   //Executing the statement
   mysqli_stmt_execute($stmt);

   //Closing the statement
   mysqli_stmt_close($stmt);

   //Closing the connection
   mysqli_close($con);
?>

這將產生以下結果 -

Table Created.....
Record Inserted.....

示例

在麵向對象風格中，這個函數的語法是 $stmt-> prepare();以下是麵向對象樣式 $minus 中此函數的示例；

<?php
   $con = new mysqli("localhost", "root", "password", "mydb");

   $query = "CREATE TABLE Test(Name VARCHAR(255), AGE INT)"; 
   $con->query($query);
   print("Table Created.....\n");

   //Initializing the statement
   $stmt = $con->stmt_init();

   $stmt->prepare("INSERT INTO Test values(?, ?)");
   $stmt->bind_param("si", $Name, $Age);
   $Name = 'Raju';
   $Age = 25;
   print("Record Inserted.....");

   //Executing the statement
   $stmt->execute();

   //Closing the statement
   $stmt->close();

   //Closing the connection
   $con->close();
?>

這將產生以下結果 -

Table Created.....
Record Inserted.....

示例

讓我們看看這個函數的另一個例子是使用 SELECT 查詢(麵向對象的風格) -

<?php
   //Creating a connection
   $con = new mysqli("localhost", "root", "password", "mydb");

   $con -> query("CREATE TABLE myplayers(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
   print("Table Created.....\n");
   $con -> query("INSERT INTO myplayers values(1, 'Sikhar', 'Dhawan', 'Delhi', 'India')");
   $con -> query("INSERT INTO myplayers values(2, 'Jonathan', 'Trott', 'CapeTown', 'SouthAfrica')");
   $con -> query("INSERT INTO myplayers values(3, 'Kumara', 'Sangakkara', 'Matale', 'Srilanka')");
   $con -> query("INSERT INTO myplayers values(4, 'Virat', 'Kohli', 'Delhi', 'India')");
   print("Records Inserted.....\n");

   //Initiating the statement object
   $stmt = $con->stmt_init();

   $stmt -> prepare("SELECT * FROM myplayers WHERE country=?");
   $stmt -> bind_param("s", $country);
   $country = "India";

   //Executing the statement
   $stmt->execute();

   //Closing the statement
   $stmt->close();

   //Closing the connection
   $con->close();
?>

這將產生以下結果 -

Table Created.....
Records Inserted.....